The diagonal entries of a Hermitian matrix must be real.（）

It is (necessary) that the (customs) (of all) nations (must be respected).

A．necessary

B．customs

C．of all

D．must be respected

It is (necessary) that the (customs) (of all) nations (must be respected).

A．necessary

B．customs

C．of all

D．must be respected

Every vessel that is to keep out of the way of another vessel must take positive early action to comply with this obligation and must ______.

A.avoid crossing ahead of the other vessel

B.avoid passing astern of the other vessel

C.sound one prolonged blast to indicate compliance

D.alter course to port for a vessel on her port side

Why must the entries be posted separately into the ledger and into the statements?

A．Because the work must be finished in a very short period of time.

B．Because it is unlikely for the same mistakes to be made in both ledger and statements and people can find the wrong entries without difficulty.

C．Because it is difficult for only one person to do it.

D．Because it is easy for people to discover mistakes by keeping accounts.

听力原文： The church welcomed a new era in a ceremony, full of ancient ritual and symbolism. After receiving his fisherman's ring and white woolen stole, sign of his authority, Pope Benedict called for Christian renewal and unity. "In a world corrupted by power and burdened by poverty," he said," the church as a whole must lead the way to Christ." He added greetings to his Jewish brothers and sisters. The Pope was later driven around the square on an open-top vehicle. He beamed and waved as he greeted his global flock.

Which one is the sign of the Pope's authority?

A．The white cap.

B．The stick.

C．The woolen strip.

D．The white woolen stole.

If it goes on to ______ its responsibilities, then the British government must act immediately in its place.

A．discipline

B．abdicate

C．bash

D．challenge

If it goes on to ______ its responsibilities, then the British government must act immediately in its place.

A．discipline

B．abdicate

C．bash

D．challenge

If it goes on to ______ its responsibilities, then the British government must act immediately in its place.

A．discipline

B．abdicate

C．bash

D．challenge

根据以下材料，回答 40～43 问题。

During a television play the sound man must be ready to make every sound as it is needed．Sound effects are of three kinds：real，imitated and recorded．

Real sounds are those of doorbells，telephone bells，and other small objects easy to keep in a studio． But the sound man must imitate many sounds． For bacon fryin9，he crumples cellophane paper．A long sheet of metal hanging in a doorway makes thunder·He taps one rubber sink plunger and then another on a table to imitate a horse walking on pavement． For a horse galloping along a gravel road，the sound man can use the two halves of a coconut，pounding each in turn very fast on the table．

Recorded sound effects are used for noises he cannot himself produce offstage．He pays records for such sounds as a rooster crowing， a train leaving a station， and a baby crying．

The sound man is an important part of any television production．

第 40 题 The sound man is important because he________

A．is kept busy

B．makes fl TV play more lifelike

C．1ets an actor know when to life a telephone receiver

D．is always learning new methods

材料:

Ships entering piracy risk areas must be aware of the risk of attack and should take appropriate measures to increase the level of surveillance（监督）and security on board and devise means of responding to attacks．A clear and comprehensive Ship Security Plan and the training of crews in security measures and response techniques are essential．Without clearly defined and rigorously practiced procedures，the risk of an uncoordinated response during the inevitable confusion of an attack increases the danger faced by those on board the ship．While a Ship Security Plan and crew training may not prevent an attack they should help reduce the risks if an attack takes place．

Attacks by pirates or armed robbers pose an immediate threat to the safety of a ship and individual crew members．When responding to attacks，masters and crews should seek to minimize the risk to those on board and maintain effective control over the safe navigation of the ship． Finally，it is important that all incidents of piracy and armed robbery，even minor incidents，are reported in detail to the appropriate authorities as soon as practicable．Accurate knowledge of the type and extent of piracy and armed robbery of ships is valuable for assessing the risk and formulating a comprehensive response.

问题：

The passage implies the following except ______．

A.Safety of lives onboard and the control of the safe navigation of the ship are the priority considerations when making decisions in responding to attacks

B.A clear and comprehensive Ship Security Plan can be developed by notifying the appropriate authorities of piracy-related information

C.The risk of an uncoordinated response during the inevitable confusion of an attack could be decreased by clearly defined and well practiced procedures

D.The communication of piracy-related information is a useful mechanism for anti-piracy Actions

Without clearly defined and rigorously practiced procedures，the risk of an uncoordinated response during the inevitable confusion of an attack increases the danger faced by those on board the ship．A.frequently

B.perioically

C.occasionally

D.strictly

Which of the following is not mentioned as the measures taken for anti-piracy ___________．A.Risk assessment and Ship Security Plan

B.security alarming system onboard

C.Practices of procedures

D.communication of piracy- or security- related information

Which of the following is correct according to the passage ___________．A.A Ship Security Plan can always define clear and comprehensive procedures

B.Rigorously practiced procedure can always prevent a piracy attack

C.A well-designed Ship Security Plan and the training of crews are significant for anti-piracy

D.A well-designed Ship Security Plan and the training of crews can always prevent the ship from being attacked

请帮忙给出每个问题的正确答案和分析，谢谢！