In the experiment, the burning inside the bottle can___.

A． equalize the air pressure inside and outside

B． make a seal in the neck of the bottle

C． finish up the oxygen inside the bottle

D． produce more oxygen inside the bottle

[单选题]The experiment ended in failure ______the lack of money.A． asB． byC． forD． with

[单选题]The heat that is produced by burning garbage can be used to______.A． make electricityB． make energy sourceC． boil waterD． save coal

[单选题]When the fuel oil is burning in the combustion chamber, it _____.A．gives up large amount of heatB．gives off large amount of heatC．gives up large amount of steamD．gives off large amount of steam

[单选题]When the fuel oil is burning in the combustion chamber, it （）.A . gives up large amount of heatB . gives off large amount of heatC . gives up large amount of steamD . gives off large amount of steam

[单选题]Since the burning or combustion takes place within the engine itself, the engine is known as （）.A . a fire -tube boilerB . an internal combustion engineC . an external combustion engineD . an internal combustion generator

[主观题]they are inside 选择_______________theirspacesuitsorthewallsoftheirspacecraft,iftheyareinside[A]but[B]because[C]so[D]for

[单选题]The experiment ______ the discovery of a cure for cancer.A． happened toB． led upC． resulted inD． set up

[单选题]The burning of the fuel adds more heat to the air charge, causing it to expand and force the engine piston to do work on the crankshaftWhat does “it” mean in this sentence?（）A . the burningB . the fuelC . the air chargeD . the engine pisto

[单选题]B．y mentioning the experiment in the second paragraph，the author implies that______.（ ）[A]our definition of what’s normal varies with gender[B]our focus of attention variesl with gender and age[C]our definition of what’s average changes over time[D]o

[单选题]The program and the data are kept inside the computer in a place called______．A．busB．cacheC．CPUD．memory