The metals which we find in the earth( )iron， lead and copper.

[单选题]Which is( )， iron or copper？A.heavierB.heavyC.more heavyD.much heavy

[问答题]The earth on which we live is shaped like a ball.

We _ the many opportunities which you will find.A. remind ofB. take delight inC.

[单选题]Which cause of the following can lead to the engine not to start on air?（）A . starting air pressure too highB . correct timing of starting air valvesC . three of the starting valves stuckD . the turning gear disengaged

[单选题]Which of the following may lead to the engine NOT to start on air?（）A . starting air pressure too highB . correct timing of starting air valvesC . three of the six starting valves stuckD . the turning gear disengaged

Only by changing _____ we live can we save the earth.A. thatB. whatC. howD. wher

We will __ all the regions until we find the missing.A. findB. exploreC. go thro

[主观题]F．ind the word in the passage which means “ the movement from one place to another of a large group of animals” and write it down here: __________.

[单选题]A．fter careful investigation we find that one of the statement has ____ to be untrue.A．turned outB．turned offC．turned upD．turned down

[单选题]We are sorry to find that the damage（）the goods was caused by heavy rain during transportation.A . onB . forC . aboutD . to