问题
单项选择题
21-三体综合征的临床表现是（）。
A.头大躯干长，四肢粗短，智力正常
B.智力落后，皮肤毛发色浅，尿有鼠臭味
C.眼距宽眼裂小，外眦上斜内眦赘皮，耳小异形
D.头大颈短，面部粘液水肿，腹胀便秘
E.前囟晚闭，出牙延迟，智力发育正常
答案
参考答案：C
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21-三体综合征的临床表现是（）。
A.头大躯干长，四肢粗短，智力正常
B.智力落后，皮肤毛发色浅，尿有鼠臭味
C.眼距宽眼裂小，外眦上斜内眦赘皮，耳小异形
D.头大颈短，面部粘液水肿，腹胀便秘
E.前囟晚闭，出牙延迟，智力发育正常
参考答案：C
Scientists are trying to make some small cars that may some day take the place of today’s big cars. If everyone drives such cars in the future, there will be 1_ pollution in the air. There will _2 be more space or parking cars in cities, and the _3_ will be less crowded. Three such cars can fit in__4__ that it is now needed for one car of the usual size. The little cars will __5___ much less to own and to drive. Driving will be __6___, too, as these little cars can go only 65 kilometers per hour. The little cars of __7___ will be fine or getting out of the city, but they will not be useful for__8__ trips. Little cars which are powered by gasoline( 汽油 ) will go 450 kilometers __9___ needing to stop for more gasoline . If big cars still are used together with the small ones, _10__ sets of roads will be needed in the future. Some roads will be used for the big, fast cars, and some roads will be needed for the slower, small ones.
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