  To distinguish between the normal $q\bar q$ and exotic diquark-antidiqark
($q^2\bar q^2$) contents of the lowest-lying scalar meson ($S_0$), we
investigate the semileptonic $D\to S_0 e^+\nu_e, S_0\to M_1 M_2$ decays, where
$M_{1(2)}$ represents a pseudoscalar meson. With the form factors extracted
from the current data, we calculate ${\cal B}(D_s^+\to \sigma_0
e^+\nu_e,\sigma_0\to\pi^0\pi^0) =(12.9^{+6.3}_{-4.9})\times 10^{-4}$ and
$(0.8^{+1.2}_{-0.7})\times 10^{-4}$ for the $q\bar q$ and $q^2\bar q^2$ quark
structures, respectively, and compare them to the experimental upper limit:
$6.4\times 10^{-4}$. It is clearly seen that $S_0$ prefers to be the $q^2\bar
q^2$ bound state. Particularly, ${\cal B}_{q\bar q}(D_s^+\to \sigma_0
e^+\nu_e,\sigma_0\to\pi^+\pi^-) =(25.8^{+12.5}_{-\;\,9.8})\times 10^{-4}$ and
${\cal B}_{q^2\bar q^2}(D_s^+\to \sigma_0 e^+\nu_e,\sigma_0\to\pi^+\pi^-)
=(1.5^{+2.4}_{-1.3})\times 10^{-4}$ are predicted to deviate far from each
other, useful for a clear experimental investigation.
