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【单选题】
已知集合A={1，2，3，4，5}，B={4，5，6，7}，则A∪B等于 [ ]A.
{4，5}
B.
{1，2，3，4，5，6，7}
C.
{1，2，3}
D.
{6，7}
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举一反三
【单选题】Try new sports, games, and other activities ________new foods.You'll grow stronger, play longer, look and feel better! [ ]
A.
such as
B.
as well as
C.
or
D.
as well
【简答题】Many new s have been designed to (play) ______ on the computer. People of all ages have been playing them.
【单选题】In ________scavenging the incoming air enters at the lower end of the cylinder and exhaust gases are forced out at the top.
A.
across
B.
loop
C.
aspirate
D.
Uniflow
【简答题】光合作用是植物利用自身的(),将可见光转化成能量,驱动()和()合成有机物,并释放()的过程。
【多选题】关于金属断裂形态特征描述正确的是( )。
A.
延性断裂的微观特征形态是韧窝
B.
脆性断裂分为解理断裂和晶界断裂
C.
解离断裂断口平整，典型的河流花样、舌状花样和扇形花样
D.
晶界断裂断口呈纤维状，断口附近有宏观塑性变形
【简答题】The critics______(只有无情的批评) for the new play.
【单选题】In ____ scavenging the incoming air is directed upwards and the exhaust gases travel down and out of the exhaust ports at the opposite side of the cylinder.
A.
cross
B.
aspirated
C.
Loop
D.
uniflow
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