等物质的量的下列各组有机物，完全燃烧时消耗氧气的量相同的是（ ）
A．乙醇和甲醚
B．乙炔和苯
C．甲醛和葡萄糖
D．甲烷和乙烷
A、乙醇分子式为C2H6O，甲醚的分子式为C2H6O，互为同分异构体，（x+
-y 4
）值都等于3，故A正确；z 2
B、C2H2的（x+
）=2+y 4
=2.5，C6H6的（x+2 4
）=6+1.5=7.5，（x+y 4
）值不相等，故B错误；y 4
C、甲醛分子式为CH2O，（x+
-y 4
）=1+z 2
-2 4
=1，葡萄糖分子式为C6H12O6，（x+1 2
-y 4
）=6+3-z 2
=6，（x+6 2
-y 4
）值不相等，故C错误；z 2
D、甲烷的（x+
）=1+1=2，乙烷的（x+y 4
）=2+1.5=3.5，（x+y 4
）值不相等，故D错误；y 4
故选A．
| 完形填空。 | |||
| Ampere 1 _a famous scientist. He liked to 2_ himself busy all day long both at home and in his office. Sometimes he found _3 _ery hard to work for a long time because many visitors came to talk to him at home. In order to have fewer visitors, Ampere thought of an idea. He put up a plate on the gate. On the plate he wrote 4__ords, "Mr. Ampere isn't at home." One day he went home from his office late in the afternoon. When he 5__is gate, he saw the plate and read it, and then be said to himself, "Oh, yes, Mr. Ampere isn't in." _6_hat he returned to his office. 7_ time, Ampere went to give a talk at a meeting. On his to the meeting hall, he passed by a river. He picked up a stone, and played with the stone in his hand and then put it _8__is pocket. Before he left the river, he took "the stone" out of his pocket and threw it back into the river. During the meeting, when Ampere wanted to see what time _9_ he was surprised to find the "watch" he took out of his pocket was not a watch, 10_stone. | |||
| ( )1.A.is ( )2.A.keep ( )3.A.that ( )4.A.this ( )5.A.got ( )6.A.Said ( )7.A.Other ( )8.A.into ( )9.A.it is ( )10.A.but | B.was B.stay B.this B.that B.got to B.With B.Another B.to B.it was B.and | C.has C.live C.it C.these C.arrived C.And C.The other C.with C.was it C.is | D.to be D.let D.its D.these D.arrived in D.after D.Others D.from D.is it D.only |