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【单选题】
关于头围的描述，正确的是A.
出生头围平均32cm，前半年增长6～8cm，后半年增长1～2cm
B.
出生头围平均34cm，前半年增长8～10cm，1岁时46cm
C.
2岁时头围44cm，5岁时46cm，15岁接近于成人54cm
D.
出生时头围30cm，每年增长10～14cm，2岁时48cm
E.
2岁时头围44cm，15岁时接近于成人50cm
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举一反三
【单选题】During Ana's flight, the flight attendant was very _______.
A.
angry
B.
nice
C.
No information
【单选题】It was recommended that passengers______smoke during the flight.
A.
not
B.
could not
C.
need not
D.
would not
【单选题】During her flight to Australia, Jenny ran into a lot of difficulties.
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】Electronic devices are allowed to be turned on during flight probably because______.
A.
they have no interference with plane's communications
B.
they are necessary devices to some passengers
C.
the reason to switch them off is different from that of cell-phone
D.
the interference they bring doesn't last long
【单选题】It is recommended that passengers______ smoke during the flight.
A.
not
B.
need not
C.
could not
D.
would not
【单选题】关于唾液分泌的调节，下列哪项叙述是错误的
A.
唾液分泌的调节完全是神经反射性的
B.
唾液分泌的初级中枢在延髓
C.
副交感神经兴奋时唾液分泌增加
D.
交感神经对唾液分泌起抑制作用
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