I will accept late work, ________I will reduce the grade by 5%.
A.while
B.so
C.but
D.if
答案:C
Poor Tim is too nervous to start his speech. Someone should remind him________.
A.how to talk
B.whether to speak
C.what to say
D.when to tell
如图是A、B、C三种物质的溶解度曲线,下列说法中不正确的是( )
A.t2℃时A和C的饱和溶液中溶质的质量分数相等
B.t1℃时100g水溶解了40gA
C.A的溶解度大于C的溶解度
D.A和B的饱和溶液从t2℃降到t1℃时溶液的溶质质量分数都变小