[填空题]Hay sees a trend towards more fraternal twins born to older woman.

[填空题]Hay sees a trend towards more fraternal twins born to older woman.

[填空题]Research has shown that twins are more likely to have problems with language skills than single babies.

[单项选择]

Jada and Jessie are twins. They were born on August 5, 1992. They are ten now and in the fourth grade. Jada and Jessie do everything together. They are in the same class. They dress alike. They look the same. People always get them confused. This really makes Jada and Jessie laugh. Teachers always get them mixed up at school. Even their father has trouble telling them apart. Their mother doesn’t, though. She always knows which twin is which. Jada and Jessie often try to confuse her, but it has never happened.
Their older brother, Jared, is fifteen. He never knows which one is which. He doesn’t even try. Jada and Jessie have the same friends. Their friends always mix them up. It doesn’t matter to Jada and Jessie.
One day, their father told their mother to get one of them a different haircut, so that he could tell them apart. Jada and Jessie were horrified. They didn’t want to look different. They liked looking the same. Their mother came to
A. Ten.
B. Twelve.
C. Fifteen.

[填空题]Hay found that parents of twins tend to favor the first-born baby, giving that twin more time and attention. Even when they start school, the first-born twin does better than the second-born.

[填空题]Hay found that twins do better in singing than the single babies.

[填空题]There is a trend that drugs are more readily available and used by youth at a younger age than ever before.

[填空题]Twins, those who share the same placenta, are more likely to have social and learning problems, as well as ______.

[填空题]A. born to be more intelligent or less intelligent
B. have a better chance to develop his intelligence
C. taught to be more intelligent
D. that intelligence was something a baby was born with
E. and because of the lack of communication with his classmates
F. and partly stimulated

It was once believed ______, and thus we can tell how successful she/he will be in the future according to his/her intelligence.