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【单选题】
下列关于昆虫变态的说法不正确的是________。A.
蜉蝣目昆虫从幼期转变为成虫期需要经过一个亚成虫期。
B.
蜻蜓目昆虫的幼期营水生生活，具有适于水生生活的某些适应性构造。
C.
雄性介壳虫从幼期转变为成虫期需要经过伪蛹期。
D.
直翅目昆虫的幼期与成虫期在习性及栖境等方面很不相同。
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【单选题】It may be inferred from this passage that icebergs are formed
A.
by a drop in ocean temperatures
B.
when an ice shelf breaks free
C.
if mountain glaciers melt
D.
from intensely cold islands
【简答题】MCS-51系列单片机的应用程序一般存放在( )中。A. 程序存储器ROM
【简答题】The author is ______ toward icebergs.
【单选题】如图所示电路中,当开关S闭合时,电压表V1、V2、V3的示数分别为U1、U2、U3,电流表A1、A2的示数分别为I1、I2(五块电表的读数均不为零),那么下列关系式正确的是( )
A.
U 2 ＝ U 1 =U 3 I 1 ＝ I 2
B.
U 2 ＝ U 1 +U 3 I 1 ＝ I 2
C.
U 3 ＝ U 1 +U 2 I 1 ＝ I 2
D.
U 3 ＝ U 1 +U 2 I 1 ＞ I 2
【单选题】Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes _____ .
A.
Iceland Current
B.
Baltic Current
C.
Labrador Current
D.
Baffin Current
【简答题】The icebergs are erous because they are hidden __ and can turn over unexpectedly.
【单选题】The Titanic was a ship just not ______to run into icebergs. When it did,nothing could stop it. [ ]
A.
design
B.
to design
C.
designed
D.
designing
【单选题】When operating in an area where sea ice and icebergs are present，which statement is TRUE? （）
A.
Icebergs may travel in a direction many degrees different from the sea ice
B.
Both icebergs and sea ice will move in approximately the same direction and at the same speed
C.
Icebergs and sea ice will move in the same direction，but at different speeds due to the sail effect of the berg
D.
Icebergs and sea ice will move in the same direction，but the iceberg will move slower because of its underwater bulk
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