公园里有6棵柏树，杏树的棵数是柏树的4倍。两种树一共有多少棵？
6×4+6=30（棵）
Kerry isn’t working hard to __________ his wife and children, which in my opinion will __________ his marriage failure.
A．bring up, add to
B．get hold of, lead to
C．provide for, contribute to
D．raise up, add up to
在同班同学患甲型肝炎后，对一10岁小儿检查发现，血清抗-HAVIgM阳性．肝功正常。此种情况属( )
A．潜在性感染B．易感者C．病原携带D．隐性感染E．显性感染
